Cast
| Name | Character | Team | |
|---|---|---|---|
 |
Bradford Dillman | Paul Grogan | Unowned |
 |
Heather Menzies | Maggie McKeown | Unowned |
 |
Kevin McCarthy | Dr. Robert Hoak | Unowned |
 |
Keenan Wynn | Jack | Unowned |
 |
Dick Miller | Buck Gardner | Unowned |
 |
Barbara Steele | Dr. Mengers | Unowned |
 |
Belinda Balaski | Betsy | Unowned |
 |
Melody Thomas Scott | Laura Dickinson | Unowned |
 |
Bruce Gordon | Colonel Waxman | Unowned |
 |
Barry Brown | Trooper | Unowned |
 |
Paul Bartel | Mr. Dumont | Unowned |
 |
Shannon Collins | Suzie Grogan | Unowned |
|
Shawn Nelson | Whitney | Unowned |
 |
Richard Deacon | Earl Lyon | Unowned |
|
Janie Squire | Barbara Randolph | Unowned |
|
Roger Richman | David | Unowned |
|
Bill Smillie | Jailer | Unowned |
 |
Guich Koock | TV Pitchman | Unowned |
|
Jack Pauleson | Boy in Canoe | Unowned |
|
Eric Henshaw | Father in Canoe | Unowned |
|
Robert Vinson | Soldier | Unowned |
|
Virginia Dunnam | Girl | Unowned |
|
Diamond Farnsworth | Water-skier | Unowned |
 |
Bruce Paul Barbour | Man in Boat | Unowned |
|
Robyn Ray | Screaming Woman | Unowned |
|
Mike Sullivan | Dam Guard | Unowned |
|
Jack Cardwell | Brandy | Unowned |
|
Sally Bondi | Swimming Deb (uncredited) | Unowned |
 |
Eric Braeden | Dr. Robert Hoak (swimming double) (uncredited) | Unowned |
 |
Joe Dante | Scuba Diver #2 (uncredited) | Unowned |
 |
Amy Holden Jones | Hertz Clerk (uncredited) | Unowned |
|
Andrew G. La Marca | Scuba Diver #1 (uncredited) | Unowned |
 |
John Sayles | Army Sentry (uncredited) | Unowned |
 |
Phil Tippett | Scuba Diver (uncredited) | Unowned |